Is using a R4 the only way to run DS games on a hacked old 3DS? Are there any homebrew apps to run those games?

Thanks a lot for any info =]

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I assuming you have a9lh since in your last thread you installed it. R4 is pefferd since it runs everything perfectly. But there is a free emulator that is in hard work to be like R4. Curently it can save and play quite a few games but not everything and it can be slow on loading times . Here it is follow the guide in it to install.